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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 04, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Trading Symbol RAPP  
Entity Registrant Name Rapport Therapeutics, Inc.  
Entity Central Index Key 0002012593  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Title of 12(b) Security Common Stock, $0.001 par value per share  
Security Exchange Name NASDAQ  
Entity File Number 001-42121  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 88-0724208  
Entity Address, Address Line One 99 High Street  
Entity Address, Address Line Two Suite 2100  
Entity Address, City or Town Boston  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02110  
City Area Code 857  
Local Phone Number 321-8020  
Document Quarterly Report true  
Document Transition Report false  
Entity Common Stock, Shares Outstanding   47,826,929